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Username Post: 3 wire alternator        (Topic#198832)
drummertom 
Member
Posts: 1852
drummertom
Age: 61
Loc: Durham NC
Reg: 09-03-06
09-14-08 08:50 AM - Post#1522062    

Does anyone know how to wire a 3 wire altenator. I know the one separate terminal is battery, but the two wires that plug in are labeled R and F on the back on the alternator and don't know where they go. Thanx guys!!
www.picturetrail.com/drummertom

"Well my time went so quickly. I went lickety spickley out to my ol' 55"


 
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raycow 
Honored Member
Posts: 18714

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
09-14-08 09:52 AM - Post#1522094    
    In response to drummertom

If you have terminals labeled R and F, that is an externally regulated alternator. I wouldn't recommend using it unless you are doing a stock resto on a car which originally came with that type, and of course that wouldn't be a tri-five. If you still want to use it, you will need the correct regulator and its corresponding 4 prong connector.

Give me a little while and I will find a wiring diagram for you, unless someone else beats me to the punch.

Ray
Bacon is the gateway drug for vegetarians - Bridget Lancaster


 
HAL_396 
Member
Posts: 2944
HAL_396
Loc: Austin, TX
Reg: 11-16-06
09-14-08 09:58 AM - Post#1522095    
    In response to raycow


On externally regulated models, there are typically four connections on the alternator - the large output terminal (BAT), the ground terminal (GRD) which may be "implied" though the metal mountings of the alternator, the field connection (F), and terminal #2 on the regulator is a separate connection to one of the three poles on the stator (R). Unlike on a generator, the BAT terminal is directly connected to the battery and the rest of the cars wiring system, while only the F, R, and GRD connections will connect to the regulator. Also, terminal #3 on the regulator (if present) is connected to the main junction block for the wiring system and serves as a "remote voltage sensing" wire. Terminal #4 on the regulator will be connected via small wires to the charge indicator light on the dashboard of the car and the charge resistance wire. The regulator itself can be a mechanical or solid state device. A typical externally regulated alternator wiring diagram from a 1963 Buick is below for reference.

1955 Chevy Custom
1966 Biscayne
1966 Caprice Drag Car Inwork
1966 Caprice parts car
2004 Silverado
2007 Impala LS
2009 G5


Edited by HAL_396 on 09-14-08 10:06 AM. Reason for edit: No reason given.

 
57 boxman 
Senior Member
Posts: 649
57 boxman
Loc: N. Texas
Reg: 03-14-04
09-14-08 10:43 AM - Post#1522118    
    In response to HAL_396

I am no electrician and the above drawing were confusing at best when switching to a three wire alt. I had to draw a diagram that I could understand. Maybe it will help you. I have the wire colors wrong because I drew them with what was there and what I had available to use. I will not certify the diagram however, it may help you with what you need.
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raycow 
Honored Member
Posts: 18714

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
09-14-08 11:13 AM - Post#1522139    
    In response to HAL_396

Yes, that looks good. Thank you.

Ray
Bacon is the gateway drug for vegetarians - Bridget Lancaster


 
raycow 
Honored Member
Posts: 18714

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
09-14-08 11:18 AM - Post#1522144    
    In response to 57 boxman

57 boxman, your diagram looks to be for an internally regulated alternator. This will have the terminals for the plug-in connector labeled 1 & 2 instead of R & F.

Ray
Bacon is the gateway drug for vegetarians - Bridget Lancaster


 
drummertom 
Member
Posts: 1852
drummertom
Age: 61
Loc: Durham NC
Reg: 09-03-06
09-14-08 02:15 PM - Post#1522218    
    In response to HAL_396

When I saw the R & F terminals, I thought it might be externally regulated. I dont have a external voltage regulator so I guess I'll look for a newer alternator. Thanx guys and as always, I can count on getting great answers here.
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"Well my time went so quickly. I went lickety spickley out to my ol' 55"


 
Gray Headed Mule 
Valued Contributor
Posts: 4732
Gray Headed Mule
Loc: Fort Worth, Texas
Reg: 12-11-03
09-14-08 08:23 PM - Post#1522447    
    In response to drummertom

Boxman! I like the little musical note on the horns!
Mule

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My 49 Chevy Fleetline Deluxe Restoration Project


 
Bad56Sedan 
"8th Year" Gold Supporting Member
Posts: 594
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
09-15-08 05:58 AM - Post#1522575    
    In response to drummertom

heres a pic of the wiring method i used in my '56
for a 3 wire alt.
uses the original wiring plug at the fire wall
internal regulator type alt
VC56S 2 door Sedan, 34 Years


 
Bad56Sedan 
"8th Year" Gold Supporting Member
Posts: 594
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
09-15-08 06:01 AM - Post#1522577    
    In response to Bad56Sedan

previous pic was too small

VC56S 2 door Sedan, 34 Years


 
acardon 
Senior Member
Posts: 9887
acardon
Loc: DFW TEXAS
Reg: 03-25-05
09-15-08 09:31 AM - Post#1522724    
    In response to Bad56Sedan

The above diagram will work, although the 55 did not have the plug at the firewall,....but....I would not won't a 80 or 100 amp alternator wire (red wire) going inside the car, by the ignition switch, before it goes back through the firewall on the 14 gauge black wire back to the battery. Here is a 55 diagram. Link to 55 wiring.
I would run a larger wire from the alternator to the starter solenoid terminal or to a pigtail on the battery cable.
Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
drummertom 
Member
Posts: 1852
drummertom
Age: 61
Loc: Durham NC
Reg: 09-03-06
09-15-08 06:01 PM - Post#1523049    
    In response to acardon

Yeah, I am going to run my battery wire from the alt straight to the battery. The alt that is on it now is an older externally regulated ( R and F terminals), so I have to get another alternator thats internally regulated then I'll wire it correctly. Thanx for all the info.
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"Well my time went so quickly. I went lickety spickley out to my ol' 55"


 
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